US20090193820A1 - Refrigeration machine and operating method for it - Google Patents

Refrigeration machine and operating method for it Download PDF

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US20090193820A1
US20090193820A1 US12/310,340 US31034007A US2009193820A1 US 20090193820 A1 US20090193820 A1 US 20090193820A1 US 31034007 A US31034007 A US 31034007A US 2009193820 A1 US2009193820 A1 US 2009193820A1
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Prior art keywords
evaporator
compressor
stop valve
condenser
refrigerating machine
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US12/310,340
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US8601831B2 (en
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Panagiotis Fotiadis
Hans Ihle
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BSH Hausgeraete GmbH
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BSH Bosch und Siemens Hausgeraete GmbH
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Assigned to BSH Hausgeräte GmbH reassignment BSH Hausgeräte GmbH CORRECTIVE ASSIGNMENT TO REMOVE USSN 14373413; 29120436 AND 29429277 PREVIOUSLY RECORDED AT REEL: 035624 FRAME: 0784. ASSIGNOR(S) HEREBY CONFIRMS THE CHANGE OF NAME. Assignors: BSH Bosch und Siemens Hausgeräte GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2347/00—Details for preventing or removing deposits or corrosion
    • F25B2347/02—Details of defrosting cycles
    • F25B2347/023—Set point defrosting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/26—Problems to be solved characterised by the startup of the refrigeration cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/27—Problems to be solved characterised by the stop of the refrigeration cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0251—Compressor control by controlling speed with on-off operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/23—Time delays
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2519—On-off valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Definitions

  • the present invention relates to a refrigerating machine, in particular for a domestic refrigerating appliance, as well as to an operating method for a refrigerating machine of said kind.
  • a refrigerating machine typically comprises a compressor, a condenser and an evaporator which are connected in a refrigerant circuit.
  • Refrigerant compressed by the compressor and heated in the process first flows through a condenser, in which it releases heat to a warm reservoir and condenses in the process, and then through an evaporator, in which it cools down due to expansion to such an extreme extent that it is able to absorb heat from a cold reservoir.
  • the refrigerant evaporated as a result flows back to the compressor.
  • the compressor does not operate continuously, but instead the compressor's operating phases and non-operating phases alternate. Whereas in the operating phases the compressor holds the refrigerant constantly at a high pressure in the condenser and at a low pressure in the evaporator, a pressure equalization takes place between the condenser and evaporator when the compressor is switched off. The drop in pressure in the condenser leads to an adiabatic cooling there, with the result that the thermal energy contained in the refrigerant can no longer be released to the warm reservoir. Conversely there is an increase in pressure in the evaporator, with the result that the temperature of the evaporator—and also that of a space cooled by the evaporator—increases in an undesirable manner.
  • the object of the invention is therefore to disclose a different approach by means of which the efficiency of an intermittently operated refrigerating machine can be improved.
  • a stop valve is disposed in a refrigerant path from the condenser to the evaporator. Since said valve is closed each time the evaporator is switched off, a high pressure can be maintained in the condenser in the non-operating phases of the evaporator. Since the stop valve is opened when the compressor is restarted, a refrigerant expanded by way of a high pressure difference and correspondingly cold is immediately available in the evaporator. A preliminary startup phase of the compressor that the latter conventionally requires in order to build up the pressure difference between condenser and evaporator that is required for cooling is no longer necessary.
  • a control unit for closing the stop valve when the compressor is switched off and opening the stop valve when the compressor is switched on is beneficially part of the refrigerating machine.
  • the control unit can advantageously be set up either to open or not to open the stop valve when the compressor is switched off. Opening the stop valve with the compressor switched off makes sense in particular when the evaporator is being defrosted, since in this case the inflow of refrigerant expanded by way of a slight pressure difference and correspondingly warm into the evaporator is altogether desirable in order to achieve fast defrosting.
  • an electric heater can be assigned to the evaporator.
  • control unit can additionally be connected to an icing sensor disposed on the evaporator and/or to a timer.
  • the object is further achieved by means of a method for operating a refrigerating machine of the above-described type, wherein the compressor is operated intermittently and the stop valve is closed when the compressor is switched off or, as the case may be, the stop valve is opened when the compressor is switched on.
  • the defrosting can be carried out in particular in a time-controlled manner at regular intervals, or it can be carried out when a critical icing of the evaporator is detected.
  • FIG. 1 shows a block diagram of a refrigerating machine according to the invention.
  • a refrigerant circuit of the refrigerating machine runs from a compressor 1 sequentially by way of a condenser 2 , a stop valve 3 , a restrictor 4 and an evaporator 5 , back to the compressor 1 .
  • Any known designs such as, say, a wound evaporator, a wire tubular evaporator etc. are suitable for the evaporator 5 ; schematically shown in the FIGURE is a plate-type evaporator having a tube running in a serpentine shape on a metal plate and in which the restrictor 4 is integrated on the plate in the form of a capillary tube.
  • the refrigerating machine is part of a domestic refrigerating appliance whose design is generally known and is therefore not shown here.
  • An electronic control unit 6 controls the operation of the compressor 1 and the status—open or closed—of the stop valve 3 with the aid of a temperature sensor 7 which is installed in a storage compartment of the refrigerating appliance that is cooled by the evaporator 5 and an icing sensor 8 disposed on the evaporator 5 itself.
  • the control unit 6 compares the temperature reported by the temperature sensor 7 with a settable upper limit value and if it detects that the limit value has been exceeded it puts the compressor 1 into operation and opens the stop valve 3 .
  • cooling capacity is available at the evaporator 5 practically without delay when the compressor 1 is switched on.
  • the start time of the compressor and the time of opening of the stop valve 3 can be slightly offset relative to each other, the time offset being chosen such that a pressure fluctuation in the condenser 2 caused by the starting of the compressor and the opening of the valve is minimized.
  • the control unit 6 compares the temperature reported by the temperature sensor 7 with a lower limit value and switches the compressor 1 off again if the temperature undershoots said limit value. At this time a check is carried out to determine whether the icing sensor 8 is indicating a critical icing of the evaporator 5 that will necessitate defrosting. If this is not the case, the control unit 6 closes the stop valve 3 at the same time as the compressor 1 is switched off in order to maintain the overpressure in the condenser 2 in the succeeding non-operating phase of the compressor 1 .
  • the stop valve 3 remains open and a pressure equalization is produced between the condenser 2 and evaporator 5 .
  • the associated pressure increase in the evaporator 5 causes on the one hand an adiabatic heating of the refrigerant already contained in the evaporator 5 ; on the other hand, the cooling-down of the refrigerant flowing through the restrictor 4 in the course of the pressure equalization slows down as the pressure difference decreases, with the result that toward the end of the pressure equalization process increasingly warm refrigerant reaches the upstream region of the evaporator 5 and thereby heats up the evaporator 5 .
  • the stop valve 3 will be opened intermittently during the defrosting process. In this way the pressure equalization is slowed down and refrigerant which expands during the pressure equalization in the condenser 2 and cools down in the process has the opportunity to heat up again in the condenser 2 itself in order then to enter the evaporator 5 at a temperature that is all the warmer in a later phase of the pressure equalization.
  • the direct monitoring of the icing of the evaporator 5 by means of the icing sensor 8 can be replaced by an indirect estimation of the icing, for example by the control unit 6 being coupled to a timer (not shown) in order to initiate a defrosting process in each case after the expiry of a predefined period of time in which an ice layer requiring defrosting normally forms.
  • control unit 6 can be coupled to a door switch, which is provided in most domestic refrigerating appliances for switching an interior light on and off, for the purpose of estimating, on the basis of the number of times the door is opened and/or their duration, an amount of moisture introduced into the appliance as a result of the door's being opened.
  • a door switch which is provided in most domestic refrigerating appliances for switching an interior light on and off, for the purpose of estimating, on the basis of the number of times the door is opened and/or their duration, an amount of moisture introduced into the appliance as a result of the door's being opened.
  • an ambient temperature sensor can also be provided which enables the moisture content of the ambient air to be estimated.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Defrosting Systems (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

A refrigeration machine for a domestic refrigerator includes a compressor, a condenser and an evaporator, which are connected to form a refrigerant circuit, wherein a stop valve is arranged in a refrigerant path from the condenser to the evaporator.

Description

  • The present invention relates to a refrigerating machine, in particular for a domestic refrigerating appliance, as well as to an operating method for a refrigerating machine of said kind.
  • A refrigerating machine typically comprises a compressor, a condenser and an evaporator which are connected in a refrigerant circuit. Refrigerant compressed by the compressor and heated in the process first flows through a condenser, in which it releases heat to a warm reservoir and condenses in the process, and then through an evaporator, in which it cools down due to expansion to such an extreme extent that it is able to absorb heat from a cold reservoir. The refrigerant evaporated as a result flows back to the compressor.
  • In most applications of refrigerating machines, in particular in the case of domestic refrigerating appliances, the compressor does not operate continuously, but instead the compressor's operating phases and non-operating phases alternate. Whereas in the operating phases the compressor holds the refrigerant constantly at a high pressure in the condenser and at a low pressure in the evaporator, a pressure equalization takes place between the condenser and evaporator when the compressor is switched off. The drop in pressure in the condenser leads to an adiabatic cooling there, with the result that the thermal energy contained in the refrigerant can no longer be released to the warm reservoir. Conversely there is an increase in pressure in the evaporator, with the result that the temperature of the evaporator—and also that of a space cooled by the evaporator—increases in an undesirable manner.
  • In order to minimize the energy losses associated with each switching-off of the compressor, it initially appears obvious to make the operating and non-operating phases of the compressor as long as possible. However, long operating and non-operating phases cause extreme temperature fluctuations in the reservoirs. If, for example, the cold reservoir is the storage compartment of a refrigerator, extreme variations in temperature can lead to chilled food products temporarily being inadequately cooled, with the consequence that their storage life is shortened, or to their being damaged due to being supercooled. While no damage to the frozen food is likely in the case of a freezer if the food is cooled down by several degrees below the long-term storage temperature, a temporarily unnecessarily low storage temperature of this kind nonetheless leads to an intensified influx of heat from outside into the storage compartment and is therefore also uneconomical.
  • The object of the invention is therefore to disclose a different approach by means of which the efficiency of an intermittently operated refrigerating machine can be improved.
  • The object is achieved firstly in that in the case of a refrigerating machine having a compressor, a condenser and an evaporator which are connected in a refrigerant circuit, a stop valve is disposed in a refrigerant path from the condenser to the evaporator. Since said valve is closed each time the evaporator is switched off, a high pressure can be maintained in the condenser in the non-operating phases of the evaporator. Since the stop valve is opened when the compressor is restarted, a refrigerant expanded by way of a high pressure difference and correspondingly cold is immediately available in the evaporator. A preliminary startup phase of the compressor that the latter conventionally requires in order to build up the pressure difference between condenser and evaporator that is required for cooling is no longer necessary.
  • A control unit for closing the stop valve when the compressor is switched off and opening the stop valve when the compressor is switched on is beneficially part of the refrigerating machine.
  • The control unit can advantageously be set up either to open or not to open the stop valve when the compressor is switched off. Opening the stop valve with the compressor switched off makes sense in particular when the evaporator is being defrosted, since in this case the inflow of refrigerant expanded by way of a slight pressure difference and correspondingly warm into the evaporator is altogether desirable in order to achieve fast defrosting.
  • In order to accelerate the defrosting process further, an electric heater can be assigned to the evaporator.
  • In order to decide on the need for defrosting, the control unit can additionally be connected to an icing sensor disposed on the evaporator and/or to a timer.
  • The object is further achieved by means of a method for operating a refrigerating machine of the above-described type, wherein the compressor is operated intermittently and the stop valve is closed when the compressor is switched off or, as the case may be, the stop valve is opened when the compressor is switched on.
  • The defrosting can be carried out in particular in a time-controlled manner at regular intervals, or it can be carried out when a critical icing of the evaporator is detected.
  • Further features and advantages of the invention will emerge from the following description of an exemplary embodiment with reference to the attached FIGURE.
  • FIG. 1 shows a block diagram of a refrigerating machine according to the invention.
    •
  • A refrigerant circuit of the refrigerating machine runs from a compressor 1 sequentially by way of a condenser 2, a stop valve 3, a restrictor 4 and an evaporator 5, back to the compressor 1. Any known designs such as, say, a wound evaporator, a wire tubular evaporator etc. are suitable for the evaporator 5; schematically shown in the FIGURE is a plate-type evaporator having a tube running in a serpentine shape on a metal plate and in which the restrictor 4 is integrated on the plate in the form of a capillary tube.
  • The refrigerating machine is part of a domestic refrigerating appliance whose design is generally known and is therefore not shown here. An electronic control unit 6 controls the operation of the compressor 1 and the status—open or closed—of the stop valve 3 with the aid of a temperature sensor 7 which is installed in a storage compartment of the refrigerating appliance that is cooled by the evaporator 5 and an icing sensor 8 disposed on the evaporator 5 itself. When the compressor 1 is in the switched-off state, the control unit 6 compares the temperature reported by the temperature sensor 7 with a settable upper limit value and if it detects that the limit value has been exceeded it puts the compressor 1 into operation and opens the stop valve 3. Refrigerant under high pressure that is still stored in the condenser 2 from a preceding operating phase of the compressor 1 flows through the restrictor 4 into the evaporator 5, expanding and cooling down in the process. Thus, cooling capacity is available at the evaporator 5 practically without delay when the compressor 1 is switched on.
  • Depending on the startup behavior of the compressor 1, the start time of the compressor and the time of opening of the stop valve 3 can be slightly offset relative to each other, the time offset being chosen such that a pressure fluctuation in the condenser 2 caused by the starting of the compressor and the opening of the valve is minimized.
  • With the compressor 1 running, the control unit 6 compares the temperature reported by the temperature sensor 7 with a lower limit value and switches the compressor 1 off again if the temperature undershoots said limit value. At this time a check is carried out to determine whether the icing sensor 8 is indicating a critical icing of the evaporator 5 that will necessitate defrosting. If this is not the case, the control unit 6 closes the stop valve 3 at the same time as the compressor 1 is switched off in order to maintain the overpressure in the condenser 2 in the succeeding non-operating phase of the compressor 1.
  • If defrosting is recognized as necessary, which can typically be the case at time intervals of several days, the stop valve 3 remains open and a pressure equalization is produced between the condenser 2 and evaporator 5. The associated pressure increase in the evaporator 5 causes on the one hand an adiabatic heating of the refrigerant already contained in the evaporator 5; on the other hand, the cooling-down of the refrigerant flowing through the restrictor 4 in the course of the pressure equalization slows down as the pressure difference decreases, with the result that toward the end of the pressure equalization process increasingly warm refrigerant reaches the upstream region of the evaporator 5 and thereby heats up the evaporator 5.
  • Further heat required for defrosting the evaporator 5 is supplied by an electric heater 9 that is likewise controlled by the control unit 6.
  • In order to maximize the heat input into the evaporator 5 by means of the refrigerant during defrosting, it can be provided that the stop valve 3 will be opened intermittently during the defrosting process. In this way the pressure equalization is slowed down and refrigerant which expands during the pressure equalization in the condenser 2 and cools down in the process has the opportunity to heat up again in the condenser 2 itself in order then to enter the evaporator 5 at a temperature that is all the warmer in a later phase of the pressure equalization.
  • According to an alternative embodiment the direct monitoring of the icing of the evaporator 5 by means of the icing sensor 8 can be replaced by an indirect estimation of the icing, for example by the control unit 6 being coupled to a timer (not shown) in order to initiate a defrosting process in each case after the expiry of a predefined period of time in which an ice layer requiring defrosting normally forms.
  • Various measures can be taken to refine the estimation of the icing by the control unit 6. Thus, for example, the control unit 6 can be coupled to a door switch, which is provided in most domestic refrigerating appliances for switching an interior light on and off, for the purpose of estimating, on the basis of the number of times the door is opened and/or their duration, an amount of moisture introduced into the appliance as a result of the door's being opened. In order to make an estimation of said kind more accurate, an ambient temperature sensor can also be provided which enables the moisture content of the ambient air to be estimated.

Claims (12)

1-11. (canceled)
12. A refrigerating machine having a compressor, a condenser and an evaporator operatively connected to one another thereby forming a refrigerant circuit, the refrigerating machine comprising a stop valve disposed in a refrigerant path extending from the condenser to the evaporator.
13. The refrigerating machine according to claim 12 and further comprising a control unit for closing the stop valve when the compressor is switched off and opening the stop valve when the compressor is switched on.
14. The refrigerating machine according to claim 13 wherein the control unit is configured for selectively opening the stop valve and not opening the stop valve when the compressor is switched off.
15. The refrigerating machine according to claim 13 and further comprising an icing sensor disposed on at least one of the evaporator and a timer and operatively connected to the control unit.
16. The refrigerating machine according to claim 12 and further comprising an electric heating apparatus operatively associated with the evaporator.
17. The refrigerating machine according to claim 12 and further comprising a bottleneck device disposed in the refrigerant path from the stop valve to the evaporator.
18. A domestic refrigerating appliance comprising a refrigerating machine having a compressor, a condenser and an evaporator operatively connected to one another thereby forming a refrigerant circuit, and a stop valve disposed in a refrigerant path extending from the condenser to the evaporator.
19. A method for operating a refrigerating machine having a compressor, a condenser and an evaporator operatively connected to one another thereby forming a refrigerant circuit and a stop valve disposed in a refrigerant path extending from the condenser to the evaporator, the method comprising the steps of operating the compressor intermittently wherein the stop valve is closed when the compressor is switched off and the stop valve is opened when the compressor is switched on.
20. The method according to claim 19 and further comprising the step of defrosting the evaporator by opening the stop valve at least temporarily when the compressor is switched off.
21. The method according to claim 20 wherein the defrosting step is carried out at regular intervals.
22. The method according to claim 21 and further comprising the step of monitoring the evaporator icing and the step of defrosting is carried out if a predetermined amount of evaporator icing is detected.
US12/310,340 2006-08-29 2007-08-07 Refrigeration machine and operating method for it Active 2031-03-29 US8601831B2 (en)

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DE102006040380 2006-08-29
DE102006040380A DE102006040380A1 (en) 2006-08-29 2006-08-29 Chiller and operating method for it
DE102006040380.0 2006-08-29
PCT/EP2007/058163 WO2008025650A1 (en) 2006-08-29 2007-08-07 Refrigeration machine and operating method for it

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CN (1) CN101512253B (en)
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US20100251737A1 (en) * 2009-03-05 2010-10-07 Sebastian Roering Method of operating a cooling system and cooling system
US20130014521A1 (en) * 2011-07-12 2013-01-17 A.P. Moller - Maersk A/S Reducing or avoiding ice formation in an intermittently operated cooling unit
US8601831B2 (en) * 2006-08-29 2013-12-10 Bsh Bosch Und Siemens Hausgeraete Gmbh Refrigeration machine and operating method for it
WO2015086058A1 (en) * 2013-12-11 2015-06-18 Electrolux Appliances Aktiebolag Refrigerator apparatus and method for control thereof

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AU2011378695B2 (en) * 2011-10-03 2017-07-27 Electrolux Home Products Corporation N.V. Refrigerator and method of operating refrigeration system
JP2013104606A (en) * 2011-11-14 2013-05-30 Panasonic Corp Refrigeration cycle apparatus and hot water producing apparatus
DE102015208259A1 (en) 2015-05-05 2016-11-10 BSH Hausgeräte GmbH Home appliance with an electric drive
CN104896875B (en) * 2015-06-04 2018-01-19 广东申菱环境系统股份有限公司 A kind of oil and gas retracting device and its automatic heat preserving control method
AU2015398422B2 (en) 2015-06-08 2021-10-28 Electrolux Appliances Aktiebolag A cooling system and a method for control thereof
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US11493260B1 (en) 2018-05-31 2022-11-08 Thermo Fisher Scientific (Asheville) Llc Freezers and operating methods using adaptive defrost

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RU2009105681A (en) 2010-10-10
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WO2008025650A1 (en) 2008-03-06

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